| 摘要 |
In order to prevent oil leakage in a hydrodynamic bearing device comprising an opening section in close proximity to a radial bearing and a lubricating fluid reservoir, a shaft 10 , thrust flange 16 , sleeve 11 , seal plate 21 , and stopper plate 20 are provided, a radial dynamic pressure bearing is formed in a radial clearance between the shaft 10 and sleeve 11 , and a thrust dynamic pressure bearing is formed in a thrust direction clearance between the sleeve 11 and thrust flange 16 . A connecting hole 11 d is formed that connects a gap between the sleeve 11 and seal plate 21 and a thrust direction gap between the sleeve 11 and thrust flange 16 . The relationship A<B<C is satisfied, where A is a radial clearance, B is a clearance between an outer peripheral surface of the shaft 10 and an inner peripheral surface of the seal plate 21 , and C is a clearance between a lower surface of the seal plate 21 and an upper end face of the sleeve 11.
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